OK thx for the tip guys but
ops: euhm to be honest I don't exactly know how to perform that heel-toe thing. Is it when you brake with the front of your foot and at the moment when the clutch clutches you give a little throttle with your heel? But for this your pedals have to be aligned good and in the yaris they aren't
The throttle pedal is much lower then the brake pedal and I've just tried it, you can hardly reach it with your heel when braking...
I didn't know this heel-toe manoever was used by so many people. I thought it was just something like left foot braking... not really nessesary.